Power-transmitting device



R. Z. FARMER. POWER TRANSMITTING DEVICE. J APPLICATION FILED JUNE 7,1920- h .2 SHEETS-SHEET 1.

5' Z. Fkrkwr n Z. FARMER. POWER TRANSMJTTI NG DEVICE; APPLICATIONQFILEDJUNE 7. 1920.

Patented MayIG, 1922.

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specification of Letters Patent. Patented; M 16 922 Application-filedJune 7, 1920. Serial Kilo. asamo.

To all whom it concern: d

Be it known that I, ROBERT Z. Famine, a citizen of the United States,residing at Roseburg, in the county of Douglas and $tate of Oregon, haveinvented certain new and useful Improvements in Power-TransmittingDevices, of which the following is a specification, reference being hadto the accompanying drawings. v

This invention relates to. certain improvements in power transmittingdevices, and it is an object of the invention to provide a deviceof'this general character having'novel and improved means wherebyendwise movement maybe imparted to a member from a rotary drivingelement It is also an object of the invention to provide a novel andimproved deviceof this neral character including a driven shaft inthreaded engagement with a non-rotatable body and which body issupported for endwise movement upon rotation of the shaft.

An additional object of the invention is to provide a novel and improveddevice of this general character particularly designed and adapted foruse in connection with the fulcrum bar of a vehicle or railway brake,the operating lever of a locomotive reverse, or other member adapted tobe moved in opposite directions at will.

The invention consists in the details of construction and in thecombination and arrangementof the several parts of my improved powertransmitting device whereby certain important advantages areattained andthedevioe rendered simpler, less expensive and otherwise more convenientand advantageous for use, as will be hereinafter more fully set forth. 1

The novel features of my invention will hereinafter be definitelyclaimed.

In order that my invention may be the to describe the same withreference to the accompanying drawings, wherein:

Figure 1 is a view in plan of a device constructed in accordance with anembodiment of my invention and shown operatively engaged with thefulcrum bar of a brake rig 'ng.

'igure 2 is a fragmentary View partly in section and partly in plan ofthe rear portion of the device as shown in Figure 1.

Figure 3 is a fragmentary view partly in section and partly in sideelevation of the forward portion of the device as illustrated inFigure-1, the fulcrum bar being omitted.

Figure t is a view in elevation with the driven shaft in sectionillustrating the drivin connection betweenthe armature and the drivenshaft, and

Figure 5 is a transverse sectional view; taken through the forwardportion ofthe device as illustrated in Figure 3.

As disclosed in the accompanying drawings, my improved deviceis shown ino erative engagement with the'fulcrum bar of the draft rigging nowgenerally employed in connection with trolley cars or the like, but itis to be understoodthat the present invention is not limited to thisparticular use as the same can be employed to equal advantage inconnection with the brake mechanism of an automobile and under whichconditions the device is reve vertically from what is shown in theaccompanying drawings. It is also to be under stood that my improveddevice may be employed in connection with the operating lever of alocomotive reverse or in connection with any other movable memberadapted to be operated or moved in opposite directions at will.

As disclosed in the accompanying drawings, A denotes a hell dimensionsand configuration and in which is mounted a motor Mof an electrical t poand which motor is adapted to be rota in reverse directions as requiredthrough the instrumentality of a reversing switch inter posed in theoperating circuit (not shown) for the motor. v

The armature or driving shaft 1 of the motor M extends extericrly of thebase A through an end or head thereof and secured in said extendedportion in a pinion 2. 'The pinion 2 is in mesh with a gear 3 fixed tothe shaft S to be hereinafter more particularly referred to.

C denotes an elongated cylindrical casing having one end portionenlarged, as at 4, and which is bolted, as at 5, or otherwise secured tothe head 6 of the base A through which the armature or driving shaft 2ex tends and whereby the inion 2 and gear 3 are enclosed or housed? The0 posits or outer end portion of the casing is closed by a removablehead 7 maintained in ap= plied position through the instrumentalit ofthe bolts 8 or as otherwisev preferre ow case of suitable inwardlydisposed ribs or The head 7 is provided with a central opening 9positioned at the axial center casing C when applied or in longitudinalalinement with the shaft S.

Secured to the outer face of the head 7 is an annular member 10 havingits internal peripheral portion partially overlying the opening 9 andwhich member 10 constitutes a bearing for the tubular piston 11. Theinner end portion of the piston 11 is provided with outwardly directedand radially alined wings or lugs 12 provided in their outer ends withthe grooves 14:, said grooves 14 being disposed in a direction.longitudinally of the piston 11.

Extending within the grooves 14 are the flanges 15 carried by the wallof the casing C and extending from the large portion/l of said casing tothe opposite end thereof. The lugs or wings 12 and the ribs or flanges15 coact in a manner whereby the piston 11 is held against rotarymovement but is permitted to have endwise movement.

'One end portion of the shaft S is rotatably supported by a thrustbearing 16 arranged within the head 6 of the base A while the oppositeend portion of said shaft S extends inwardly of the piston 11. Theinserted end portion of the shaft S is tapered or conical, as at 17 andengageswithin a conical recess 18 provided in the inner face of thebearing block 19. The block 19 is snugly engaged within the outer endportion of the piston 11 but is capable of movement in a directionlengthwise ofsaid piston 11.

The block 19 is constantly urged inwardly through the medium of theexpansible member 20 herein disclosed as a coiled spring lnterposedbetween the block 19 and the shank 21 engaged within the outer end ofthe piston 11. The outer end of the shank 21 is provided with a fork F,the arms 22 of which straddling the fulcrum bar B and each of said arms22 is provided with a longitudinally disposed slot 23 through whichextends a pin or lug 24 carried by the bar B so that upon endwisemovement of the piston 11, a desired swinging movement will be impartedto the bar B.

The shank 21 is keyed to the piston 11 through the instrumentality ofthe screwor shank 25 threaded through the shank 21 and having its endportions engaged within the circumferentially disposed slots 26 providedin the wall of the piston 11. By this means, the shank 21 and the fork Fare capable of slight rotary movement relative to the piston 11 tocompensate for any irregularity in the direction of travel of thefulcrum bar B.

The shaft S from is inserted end port on and throughout the majorportion of its length is provided with the square thread 27 vith whichis adapted to engage the internal square thread 28 carried by the innerend of the mined point in advance portion of the piston 11. Theexpansible member 'or spring 20 in addition to constantly urging thebearing block 19 inwardly, also operates to constantly urge the piston11 forwardly, so that when the piston 11 is in release or neutralposition, the threads 27 and 28 are maintained in such position thatimmediately upon rotation of the shaft S in the requisite direction, thethreads 27 and 28 will engage in such manner to cause the piston 11 tomove outwardly.

f The threads 27 terminate at a predeterof the gear wheel 3 periphery ofsaid portion of smooth and unobstructed, said portion 29 being of alength in excess of the length of the internal threads 28. By thismeans, when the piston 11 is in release or neutral position, it will notjam as the threads 27 and 28 are disconnected.-

The head 7 is provided at diametrically opposed points with theoutstanding ears or lugs 30 with which the fulcrumbar B or other elementto which the fork F may be attached is adapted to contact to prevent thesame from jamming and particularly when the fulcrum bar or the like isbeing adjusted or set with-respect to the fork F.

From the foregoing description it is thought to be obvious that a powertransmitting device constructed in accordance with my invention isparticularly well adapted for use by reason of the convenience andfacility with which it may be assembled and operated, and it will alsobe obvious that my invention is susceptible of some change and,modification 'without departing from the principles and spirit thereofand for this reason I do not wish to be understood as limiting myself tothe precise arrangement and formation of the several parts herein shownin carrying out my invention in practice except as hereinafter claimed.

I claim:

1. A device of the class described comprising a tubular piston supportedfor endwise movement, a shaft extending within the piston, a bearingblock within the outer end portion of the piston for coaction with theinserted end of the shaft, said block being movable lengthwise of thepiston, and yieldable means for urging the block inwardly of the piston.

2. A device of the character described comprising an elongated casing,an endwisc movable tubular piston extending within the casing, coactingmeans carried by the piston and the casing to hold the piston againstrotary movement, a shaft extending within the piston through the innerend thereof, a bearing block slidably engaged within the outer endportion of the piston for coaction with the inserted end of the shaft,yieldable means for urging the bearwhereby the the shaft S is piston andthe casing to hold the piston against rotary movement, a shaft extendlngwithin the piston through the inner end thereof, a bearing blockslidably engaged within the outer end portion of the piston for coaetionwith the inserted end ofthe shaft, yieldable means for urging thehearing block inwardly of the piston, said shaft and piston beingprovided with coacting threads, and means for rotating the shaft, saidshaft rotating independently of the pis-v ton when the piston is at thelimit of its movement in one direction, said piston when in said lastnamed position placing the yieldable means coacting with the bearingblock under tension to ur e the piston in a direction to cause thethreads of the piston and the threads of the shaft to engage. 4. Incombination with a movable memher, a shaft, a tubular piston threaded onsaid shaft and in operative connection with the movable member, meansfor rotating the shaft for imposing push or pull upon the piston, andyieldable means within the tubular piston for limiting the movement ofthe piston in one direction.

5. In combination with a movable memher, a shaft, a tubular pistonthreaded on the shaft and in operativeconnection with the movablemember, means for rotating the shaft for imposing push or pullvupon thepiston, and expansible means within the piston for limiting the movementof the piston in one direction.

6. A device of the character described cdm prising a casing, a pistonmovable within the casing, a member exteriorly of the casing with whichthe piston is operatively con nected, and an outstanding ear carried bythe casing with which the member is adapted to contact. f

7. A device of the character described comprising a casing, a pistonmovable within the casing,a member exteriorly of the casing with whichthe piston is operatively connected, and an outstanding ear carried bythe casing with which the member is adapted to contact, 'the connectionbetween the piston and the member being loose.

In testimony whereof hereunto afix my signature.

ROBERT Z. FARMER-

